Work, Energy and Power questions
712 published questions with worked solutions.
- An elevator in a building can carry a maximum of 10 person, with the average mass of each person being 68 kg. The mass of the...
- If a rubber ball falls from a height h and rebounds upto the height of h/2. The percentage loss of total energy of the initial...
- A body is moving unidirectionally under the influence of a constant power source. Its displacement in time t is proportional to:
- A bullet of mass 50 g is fired with a speed 100 m/s on a plywood and emerges with 40 m/s. The percentage loss of kinetic energy...
- Four particles A, B, C, D of mass m2, m, 2m, 4m have same momentum, respectively. The particle with maximum kinetic energy is:
- A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg. If the frictional force on the elevator...
- When kinetic energy of a body becomes 36 times of its original value, the percentage increase in the momentum of the body will be:
- A cricket ball of mass 0.15 kg is thrown vertically up by a bowling machine so that it rises to a maximum height of 20 m after...
- A particle of charge q and mass m is subjected to an electric field E=E_0(1-ax^2) in the x-direction, where a and E_0 are...
- Two identical cylindrical vessels are kept on the ground and each contain the same liquid of density d. The area of the base of...
- A person pushes a box on a rough horizontal plateform surface. He applies a force of 200 N over a distance of 15 m. Thereafter,...
- A body of mass 2 kg is driven by an engine delivering a constant power 1 J/s. The body starts from rest and moves in a straight...
- If the potential energy between two molecules is given by U=- A r^6 + B r^ 12 , then at equilibrium, separation between...
- At any instant of time t, the displacement of any particle is given by 2t-1 (SI unit) under the influence of force of 5N. The...
- The energy that will be ideally radiated by a 100 kW transmitter in 1 hour is :
- An electric lift with a maximum load of 2000 kg (lift + passengers) is moving up with a constant speed of 1.5 m s^ -1 . The...
- A spherical ball of mass 2 kg falls from a height of 10 m and is brought to rest after penetrating 10 cm into sand. The average...
- A 1 kg block subjected to two simultaneous forces (2î+3ĵ+4k̂) N and (3î−ĵ−2k̂) N is moved a distance of 25 m along (3î−4ĵ)...
- A body of mass 2 kg begins to move under the influence of time dependent force F = (2t i + 6t^2 j) N, where î and ĵ are unit...
- A body of mass 1 kg moves along a straight line with a velocity v=2x². The work done by the body during displacement from x=0 to...
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